My FI's dad got remarried when he was 11 and is decently close with his step mother. I invited her to my shower even though that meant having his step mom and mom at a relatively small event together. They see each other at events sometimes and are civil so that should be fine. The problem is that I didn't invite her two daughters. I like them and all, but we aren't close and IMO a shower is only for close friends and family. I just didn't really give much thought to inviting them because it didn't seem natural to do so. My FSMIL just found out and she's MAD. My FI's dad said she didn't sleep last night..now my FI and his dad are fighting about whether I should invite them - and they never fight! This blows my mind and has taken me totally by surprise. I do not take well to being bullied. She's made such a stink about it that I don't even want HER to come anymore. So do I invite them just to placate her and avoid more drama? Or tell her there just wasn't room on the list?